Wire fabric



No. 622,279. Patented Apr. 4, |899. M. L. SEVERY & G. S. HEATH.

WIRE FABRIC.

(Application led Jan. 28, 1898.)

(No Model.)

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' NiTED STATES PATENT Enron.

MELVIN L. SEVERY, OF ARLINGTON, AND GEORGE S. HEATH, OF REVERE, MASSACHUSETTS.

WIRE FABRIC.

SPECIFICATION forming' part Of Letters Patent N0. 622,279, dated April. 4, 1899.

Application filed .Tanuary 28, 1898. Serial No. 668,314. (No model.)

T @ZZ whom, it muy concern:

Be it known that we, MELvIN L. SEVERY, residing at Arlington Heights, in the county of Middlesex, and GEORGE S. HEATH, residing at Reverein the county of Suffolk, State of Massachusetts,citizens of the United States, have invented a new and useful Wire Fabric,

- of which the following is a full, clear, and

exactdescription.

On the 12th of November, 1895, a patent was issued to M. L. Severy, numbered 549,691, for an improved platen for printing-presses,which patent covers ablanket composed of a series of resiliently depressible points. Among other ways shown in said patent for forming such blanket is one consisting of a multi-- plicity of short wires held substantially perpendicular to the impression-surface and bent in'order to make their points resiliently depressible and to determine the direction ofv their fleXure.

The object of our invention is the construction of such a blanket embodying the improvements in detail which We have found by careful experiment to give the very best possible results in actual use.

Referring to the drawings forming part of this specification, Figure l is a perspective view of a brief section of our improved blanket. Fig. 2 is a detail View showing how the Wires are held in the fabric-base. Fig. 3 is an elevation, upon an enlarged scale, of the double-pointed wire; and Fig. 1l gives views of two slightly-different forms of the Wire, looked at from a point at right angles to that of Fig. 3.

As shown in Fig. 1, the Wires A rise substantially vertically from the base or backing B, which is preferably of Woven fabric and very strong and heavy. For better retaining these wires in place 'We usually make them double-pointed staples, as shown in Fig. 2, inserting them during the process of manufacture from the under side of the fabric. As shown in said patent to Severy, these Wires are each bent considerably in order'to determine the direction of their iiexure and in order to render their points depressible, and several different forms and arrangements of bends are therein illustrated. In none of them, however,

is there embodied the principle which, as We have recently discovered, is alone capable of giving the most perfect results for the highest grades of printing. This newly-discovered principle is, in effect, that when printing the -initial pressure imparted by the platen must be even iirmer than when the platen has yielded somewhat thereunder. In other Words, the platen must not steadily increase its pressure from the instant the paper is struck until the press reaches the full end of its stroke, but must give its maximum resistance at substantially the moment of impact and then yield to allow for the inequalities of the printing-surface. This result We finally succeeded in accomplishing by making the bend in the Wire A, as shown in Fig. 1, and more in detail and upon a larger scale in Fig. 4t. In said last igure, Where a represents one of the wires, it will be seen that the bend is such that the deflection from a right line Z, joining the eX- tremities of the Wire, is scarcely more than the diameter of the Wire itself, as at l. The bend in the wire a is shown to be abrupt at the point Z', while the wire a is represented with a gradual bend, making, in effect, a curve or a portion of a circle; but in each case the degree of departure from a straight line is very slight. It will further be observed that this point of maximum bend occurs, preferably, midway between the tips as of the Wires and their bases a2. This base, it will be remembered, is beneath the fabric B, and hence said bend does not come midway between the upper surface b of the fabric and the Wire tips, but at the median point of the extremities of each wire. The purpose of this is as follows: In order that the depressible points of this blanket shall perform their desired function, the bases of the Wires abut against the metal surface of the platen c or cylinder, and since the points or tips thereof are in exact alinement with the supporting-bases all tendency on the part of the blanket to creep or crawl upon the platen is Wholly removed. This result is achieved not only because said points and bases are in substantially perpendicular alinement to the platensurface beneath, but since the bend of the Wire is midway thereonthe strain of iieXu're is IOO evenly divided between the two sections and the tendency to lateral creeping is still further removed.

lVhat We claim as our invention, and desire to secure by Letters Patent, is as follows, to Wit:

l. As an article of manufacture, the hereindescribed blanket for printing-presses comprising a series of comparatively stiff but resilient iibers held at substantially right angles to a supporting-base, and having their outer points forming a uniform impression-surface, each of said fibers having normally a central deflection from a right line of approximately the diameter of such fiber, whereby the initial pressure against the points of these fibers shall be the most strongly resisted.

2. As an article of manufacture, the hereindescribed blanket for printing-presses cornprising a series of comparatively stiff but re- MELVIN L. SEVERY. GEORGE S. HEATH.

Witnesses:

D. H. CAMPBELL, A. B. UPHAM. 

